POWER LOSS (mW)
LTC3637
76V, 1A Step-Down
Regulator
FEATURES DESCRIPTION
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Wide Operating Input Voltage Range: 4V to 76V
The LTC 3637 is a high efficiency step-down DC/DC
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Internal 350m Power MOSFET
regulator with an internal high side power switch that
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No Compensation Required
draws only 12A DC supply current while maintaining a
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Adjustable 100mA to 1A Maximum Output Current
regulated output voltage at no load.
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Low Dropout Operation: 100% Duty Cycle
The LTC3637 can supply up to 1A load current and features
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Low Quiescent Current: 12A
a programmable peak current limit that provides a simple
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Wide Output Range: 0.8V to V
IN
method for optimizing efficiency and for reducing output
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0.8V 1% Feedback Voltage Reference
ripple and component size. The LTC3637s combination
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Precise RUN Pin Threshold
of Burst Mode operation, integrated power switch, low
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Internal and External Soft-Start
quiescent current, and programmable peak current limit
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Programmable 1.8V, 3.3V, 5V or Adjustable Output
provides high efficiency over a broad range of load currents.
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Few External Components Required
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With its wide input range of 4V to 76V, and programmable
Programmable Input Overvoltage Lockout
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overvoltage lockout, the LTC3637 is a robust regulator
Low Profile (0.75mm) 3mm 5mm DFN and
suited for regulating from a wide variety of power sources.
Thermally-Enhanced MSE16 Packages
Additionally, the LTC3637 includes a precise run threshold
and soft-start feature to guarantee that the power system
APPLICATIONS
start-up is well-controlled in any environment.
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Industrial Control Supplies
The LTC3637 is available in the thermally-enhanced
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Medical Devices
3mm 5mm DFN and the MSE16 packages.
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Distributed Power Systems
n L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
Portable Instruments
of Linear Technology Corporation. All other trademarks are the property of their respective
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Battery-Operated Devices owners.
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Automotive
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Avionics
TYPICAL APPLICATION
Efficiency and Power Loss vs Load Current
100
12.5V to 76V Input to 12V Output, 1A Regulator
V = 12V
OUT EFFICIENCY
90
10H
V 80
OUT
V
IN
12V
V SW
IN
12.5V TO 76V
70
1A
47F
2.2F
200k
LTC3637
60 1000
RUN V
FB 50
SS
35.7k
40 POWER LOSS 100
FBO V
PRG1
30
V
PRG2
OVLO I
SET 20 10
V = 24V
IN
GND
V = 48V
10 IN
V = 76V
3637 TA01a IN
0 0
0.1 1.0 10 100 1000
LOAD CURRENT (mA)
3637 TA01b
3637fa
1
For more information www.linear.com/LTC3637
EFFICIENCY (%)LTC3637
ABSOLUTE MAXIMUM RATINGS (Note 1)
V Supply Voltage ..................................... 0.3V to 80V Storage Temperature Range .................. 65C to 150C
IN
RUN Voltage............................................... 0.3V to 80V Lead Temperature (Soldering, 10 sec)
SS, FBO, I Voltages ................................. 0.3V to 6V MSOP ...............................................................300C
SET
V , V , V , OVLO Voltages .............. 0.3V to 6V
FB PRG1 PRG2
Operating Junction Temperature Range (Notes 2, 3, 4)
LTC3637E, LTC3637I ......................... 40C to 125C
LTC3637H .......................................... 40C to 150C
LTC3637MP ....................................... 55C to 150C
PIN CONFIGURATION
TOP VIEW
SW 1 16 GND
TOP VIEW
NC 2 15 NC
SW 1 16 GND
V 3 14 RUN
IN
V 3 14 RUN
IN
NC 4 13 NC
17 17
FBO 5 GND 12 OVLO GND
FBO 5 12 OVLO
6
V 11 I
PRG2 SET
V 7 10 SS
V 6 11 I
PRG1 PRG2 SET
8
GND 9 V
FB
V 7 10 SS
PRG1
MSE PACKAGE
GND 8 9 V
VARIATION: MSE16 (12) FB
16-LEAD PLASTIC MSOP
T = 150C, = 45C/W, = 10C/W DHC PACKAGE
JMAX JA JC
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB 16-LEAD (5mm 3mm) PLASTIC DFN
(NOTE 6)
T = 150C, = 43C/W, = 5C/W
JMAX JA JC
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3637EMSE#PBF LTC3637EMSE#TRPBF 3637 16-Lead Plastic MSOP 40C to 125C
LTC3637IMSE#PBF LTC3637IMSE#TRPBF 3637 16-Lead Plastic MSOP 40C to 125C
LTC3637HMSE#PBF LTC3637HMSE#TRPBF 3637 16-Lead Plastic MSOP 40C to 150C
LTC3637MPMSE#PBF LTC3637MPMSE#TRPBF 3637 16-Lead Plastic MSOP 55C to 150C
LTC3637EDHC#PBF LTC3637EDHC#TRPBF 3637 16-Lead (5mm 3mm) Plastic DFN 40C to 125C
LTC3637IDHC#PBF LTC3637IDHC#TRPBF 3637 16-Lead (5mm 3mm) Plastic DFN 40C to 125C
LTC3637HDHC#PBF LTC3637HDHC#TRPBF 3637 16-Lead (5mm 3mm) Plastic DFN 40C to 150C
LTC3637MPDHC#PBF LTC3637MPDHC#TRPBF 3637 55C to 150C
16-Lead (5mm 3mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: